It is difficult, if not impossible, to select any single test that will model the expected performance of hydraulic fluids in a wide range of hydraulic pumps. Increased pressures often encountered in new hydraulic pump applications compounds this problem. However, some basic assessment of hydraulic fluid performance is necessary for numerous reasons such as: developing an appropriate fluid purchase policy, international standard development, fluid classification and others. Since the classic standard tests such as: ASTM D2882, DIN 51389 and others are simply inadequate for this task and also since the manufacturer , Eaton Inc., no longer manufactures these pumps, it has been necessary to develop an alternative test [1][2][3]. The Bosch-Rexroth Corporation has developed a high-pressure piston pump test that has been an excellent predictor of hydraulic fuid performance for many years. This test is currently being developed as a candidate for an ASTM Standard and is the subject of this report.
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